Fan speed control



FIG. 1 is a perspective view.

FIG. 2 is a front view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The rear view is unornamented.

The broken lines represent unclaimed subject matter. 

The ornamental design for a fan speed control, as shown and described. 